"To abandon these five things that weaken the training, one should develop the four frames of reference. Which four? There is the case where a monk remains focused on the body in & of itself -- ardent, alert, & mindful -- putting aside greed & distress with reference to the world. He remains focused on feelings in & of themselves ... mind in & of itself ... mental qualities in & of themselves -- ardent, alert, & mindful -- putting aside greed & distress with reference to the world. To abandon the five things that weaken the training, one should develop these four frames of reference."